Safety-lock for relatively reciprocal members.



W. H. CAMERON. SAFETY LOCK FOR RELATIVELY REOIPROCAL MEMBERS.

APPLICATION FILED JUNEfi, 1911.

Patented July 9, 1912.

WITNESSES."

1U Mann s'ra'rns ra'rnnr cannon.

WILLIAM H. CAMERON, OF TOLEDO, OHIO, ASSIGNOR TO THE 711111129,.-OV'IS'IRILABTID COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

SAFETY-LOCK FOR RELATIVELY RECIPROCAL MEMBERS.

Specification of Letters Patent.

Patented July 9, 1912.

T all whom it may concern:

Be itknown that LW'ILLIAM H. CAMERON,

a citizen of the United States, and a resident of Toledo, in the county of Lucas and 5 State of Ohio, have invented a certain new and useful Safety-Lock for Relatively Reciprocal Members; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to the figures of reference marked thereon, which forlil a part of this specification.

My invention relates to means for locking either of a. pair of relatively reciprocal members against shifting movements. when the other has been shifted from neutral position, and is particularly intended for use in connecting with the reciprocal gear shifting members of variable speed power transmission mechanisms, but is not restricted to such use as it may be used in any connection for which it is applicable.

The object of my invention is the provision of improved means of this character, which is automatically operable to positively lock either of two reciprocal members, working one within the other, in neutral position when the other is being shifted, and which prevents a shifting of both members in unison, thus preventing a stripping of the gear teeth or other injury which would be occasioned to an associated power transmission mechanism if both members were shifted in unison.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms,-a preferred embodiment thereof is illustrated in the accompanying drawing which is a-longitudinal section of a houslng with my invention associated therewith and with parts broken away.

Referring to the drawing, 8 designates a housing which may form a portion of the housing of a power transmission mechanism and in which are suitably mounted the longitudinally shiftable rods or members 13 and 14 which are shown as being in nested or concentric relation, or working one within the other.

The shift-rod locking means of my in-.

rocking movements in the plane of said rods, as shown. One end of the I rocker member 16 is angled, as at 18, toward the inner end portion of the rod 13 in position to seat within a registering notch 19therein when the rod is in neutral'position while the other end thereof is angled,-a s at 20, to enable it to seat within a registering notch 21 in the portion of the rod 14 which projects beyond the inner end of the rod 13 when the rod 14 is in neutral position, as hereinafter more angled ends of the locking member are of suit-able length to enable either but not both of them to seat within their respective notches 19, 21 at one time, the permissible rocking movement of the member 16 being substantially equal to the depth of said notches to enable either end of the member to stand retracted from the path of movemerit of its notch when the other end'is seated in its notch.

It is apparent that when either rod 13, 14 is shifted from its neutral position the movement of the notch of such rod and coacting lever end from engagement effects a rocking of the member 16 to move its opposite end into engagement with the notch of the other rod, if it be out of engagement therewith, and the released end then coacts with the side of the moving rod to positively retain the other end of the member in looking engagement with the notch of the stationary rod to prevent a movement thereof from neutral position until the moving rod has returned to its neutral position. To

facilitate .1 disengaging of a notch and coacting member end when a rod is'moved from neutral posit-ion the notches and member ends are rounded as shown, so that-when relatively moved one will exert a cam action on the other.

Spring pressed detents 22 and 23 arecarried by-parts of the housing 8, and one coacts with notches 24; in the rod 13 and the fully described. The

other works through a slot 25 in therod 13 and coacts with notches 26 in the rod 14 to yieldingly retain the respective rods in neutral or shifted positions, as isapparent. As

the mechanism for selectively shifting the rods 13 and 14 forms no part of the present invention the same is scribed.

It is apparent that I have provided sim' ple and eflicient means which is automatically operated upon a shifting of either not shown and deshift-rod 13, 14 from neutral position to positively lock the other rod in neutral position, thus insuring the desired selective shifting of parts associated therewith and preventing accident due to a shifting of more than one ofsuch parts at a time.

I wish it understood that my invent-ion is not limited to usein connection with any to lock either member in neutral position upon a shifting oft-he other member from neutral position.

2. In a power transmission mechanism, the combination with a pair of reciprocally movable gear shifting members, one working within the other, of a. rocker member as:

sociated therewith andhaving its ends angled to adapt it to engage portions of said shiftable members, said rocker member being automatically operable by a movement of either shifting member from a predetermined posit-ion to lock either member in one position of its movement.

In a power transmission mechanism, the combination with a pair of concentric reciprocally movable gear shifting members, of a rocker member automatically operable by a movement of either shifting member from neutral position to lock the other shifting member in neutral position.

4. In a power transmission mechanism, the combination with a pair of concentric reciprocally movable gear shifting members each having a-notch therein, of means. automatically operable by a movement of either shifting member from neutral position to lock the other shifting member in neutral position..

5. In a power transmission -mechanism, the combination with a pair of concentric reciprocally movable gear shifting members each having a notch therein, of 'a rocker member pivoted adjacent said shifting members and having its ends angled in position to work into respective ones of said notches when the shifting members are in neutral position, said rocker member being automatically operable by a shifting move' ment of either shifting member to cooperate With the notch in the other shifting member to lock it in neutral position.

In testimony whereof, I have hereunto signed my name presence of two subscribing witnesses.

H WILLIAM H. CAMERON.

Witnesses:

C. W. OWEN, E. E. THOMAS.

to this specification in the 

